To Connect The Refrigerant Piping To The Outdoor Unit; Checking The Refrigerant Piping; To Check For Leaks - Daikin R32 Split Series Installation Manual

4 Installation
Port Class
C + D 15, 20, 25, 35
42, 50, 60
71
5MXM90
A + B 15, 20, 25, 35
C 15, 20, 25, 35
42, 50, 60
D + E 15, 20, 25, 35
42, 50, 60
71
1 2 3
Reducer type
1
2
3
4
5
6
Connection examples:
▪ Connecting a Ø12.7 mm pipe to a Ø15.9 mm gas pipe connection
port
a b
a Outdoor unit connection port
b Reducer no. 1
c Reducer no. 3
d Flare nut for Ø15.9 mm
e Inter-unit piping
▪ Connecting a Ø9.5 mm pipe to a Ø15.9 mm gas pipe connection
port
a b
a Outdoor unit connection port
b Reducer no. 6
c Reducer no. 5
d Flare nut for Ø9.5 mm
e Inter-unit piping
▪ Connecting a Ø9.5 mm pipe to a Ø12.7 mm gas pipe connection
port
a b
a Outdoor unit connection port
b Reducer no. 2
c Reducer no. 4
d Flare nut for Ø12.7 mm
e Inter-unit piping
Installation manual
10
Reducer
5+6
1+3
—
—
2+4
—
5+6
1+3
—
4 5 6
Connection
Ø15.9 mm → Ø12.7 mm
Ø12.7 mm → Ø9.5 mm
Ø15.9 mm → Ø12.7 mm
Ø12.7 mm → Ø9.5 mm
Ø15.9 mm → Ø9.5 mm
Ø15.9 mm → Ø9.5 mm
c d e
c d e
c d e
Coat the threaded connection port of the outdoor unit where the flare
nut comes in with refrigeration oil.
Flare nut for (mm)
Ø9.5
Ø12.7
Ø15.9
NOTICE
Use an appropriate wrench to avoid damaging the
connection thread by overtightening the flare nut. Be
careful NOT to overtighten the nut, or the smaller pipe may
be damaged (about 2/3-1× the normal torque).
4.2.2 To connect the refrigerant piping to the
outdoor unit
▪ Piping length. Keep field piping as short as possible.
▪ Piping protection. Protect the field piping against physical
damage.
WARNING
Connect the refrigerant piping securely before running the
compressor. If the refrigerant piping is NOT connected and
the stop valve is open when the compressor is run, air will
be sucked in. This will cause abnormal pressure in the
refrigeration cycle, which may result in equipment damage
and even injury.
1 Connect the liquid refrigerant connection from the indoor unit to
the liquid stop valve of the outdoor unit.
b
c
a Liquid stop valve
b Gas stop valve
c Service port
2 Connect the gas refrigerant connection from the indoor unit to
the gas stop valve of the outdoor unit.
NOTICE
It is recommended that the refrigerant piping between
indoor and outdoor unit is installed in a ducting or the
refrigerant piping is wrapped with finishing tape.
4.3

Checking the refrigerant piping

4.3.1

To check for leaks

NOTICE
Do NOT exceed the unit's maximum working pressure (see
"PS High" on the unit name plate).
NOTICE
Make sure to use a recommended bubble test solution
from your wholesaler. Do not use soap water, which may
cause cracking of flare nuts (soap water may contain salt,
which absorbs moisture that will freeze when the piping
gets cold), and/or lead to corrosion of flared joints (soap
water may contain ammonia which causes a corrosive
effect between the brass flare nut and the copper flare).
Tightening torque (N•m)
33~39
50~60
62~75
a
c
3(A)MXM+3(A)MXF+4MXM+5MXM
R32 Split series
3P600450-1 – 2019.10